Oxidation during reductive cyclisations using Bu3SnH
作者:W.Russell Bowman、Harry Heaney、Benjamin M. Jordan
DOI:10.1016/s0040-4020(01)96061-2
日期:1991.1
Reductivecyclisations using Bu3SnH include an “oxidation” step if the removal of an acidic proton from the intermediate cyclised radical, by Bu3SnH acting as a base, is favourable. A “pseudo” SRN1 mechanism is proposed.
如果通过Bu 3 SnH作为碱从中间环化自由基中除去酸性质子是有利的,则使用Bu 3 SnH进行的还原环化包括一个“氧化”步骤。提出了一种“伪” S RN 1机制。
Ultrasound-promoted intramolecular direct arylation in a capillary flow microreactor
作者:Lei Zhang、Mei Geng、Peng Teng、Dan Zhao、Xi Lu、Jian-Xin Li
DOI:10.1016/j.ultsonch.2011.07.008
日期:2012.3
An intramoleculardirectarylation of various aryl bromides was performed using ultrasonic irradiation and a continuous flow capillary microreactor. The present procedure provided a higher functional group tolerance, ligand-free, milder reaction conditions and a shorter reaction time for the directarylation compared with the conventional methods. The ultrasonic irritation not only greatly promoted
Synthesis and antibacterial activity of 5-methylphenanthridium derivatives as FtsZ inhibitors
作者:Fang Liu、Henrietta Venter、Fangchao Bi、Susan J. Semple、Jingru Liu、Chaobin Jin、Shutao Ma
DOI:10.1016/j.bmcl.2017.06.005
日期:2017.8
5-Methylphenanthridium derivatives were designed, synthesized and evaluated for their in vitro antibacterialactivity and cell division inhibitory activity against various Gram-positive and -negative bacteria. Among them, compounds 5A2, 5B1, 5B2, 5B3, 5C1 and 5C2 displayed the best on-target antibacterialactivity with an MIC value of 4 µg/mL against B. subtilis ATCC9372 and S. pyogenes PS, showing
for the direct arylation of benzothiazole by employing oxime-derived palladacycle 1 as a catalyst was developed. The new catalyst system can be used for 2-arylations by using aryl bromides and iodides. In addition, this method is especially suitable for the intramolecular direct coupling of bromo- and iodoamides, as well aschloroamides, to achieve a rapid synthesis of benzo[c]phenanthridine alkaloids
Palladium-catalysed cyclisation of 2-substituted halogenoarenes by dehydrohalogenation
作者:D.E. Ames、A. Opalko
DOI:10.1016/s0040-4020(01)91149-4
日期:1984.1
satisfactory system being palladium(II) acetate in NN-dimethylacetamide (DMA) with sodium carbonate as base) has been examined as a route to some heterocyclicsystems. Whereas dehydrogenativecyclisation processes require stoichiometric amounts of palladium(II) reagent, the present procedure involves only catalytic amounts (0.1 molar proportion, or less), of palladium compound. The preparation of dibenzofuran